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Design and Fabrication of Supercapacitors Based on Modified Carbon Nanospheres Using Transition Metal Oxide/Hydroxide

Abbasi, Samaneh | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52777 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Shahrokhian, Saeed
  7. Abstract:
  8. Herein a simple tow step method is developed to design hierarchical binder free structure of binary nickel cobalt carbonate hydroxide decorated hydrothermal carbon sphere. First carbon sphere were synthesized on nickel foam via hydrothermal process using glucose solution followed by carbonization process. Ni Co carbonate hydroxide core shell array were directly grown on binder free carbon spheres using hydrothermal method. The synthesized electrode afforded high specific capacitance (497/83 mAhg-1 at a current density of 1/4 A g-1) and good cyclic stability (85% after 1500 charge / discharge cycles). EIS measurement showed negligible internal resistance (0.638 Ω) which is attributed to the reduced ionic resistance of core/shell-like nanostructures that were directly grown on the HTCSs and to the binder free architecture of the prepared electrode. The asymmetric F/CS@NiCoCH//AC/NF based suoercapacitor devices were fabricated by employing NF/CS@NiCoCH and AC/NF based electrodes as positive and negative electrodes respectively. The assembled astmmetric supercapacitor with a broad potential window, not only derived high energy density ( 19.03 Wh Kg-1) at a suitable power density ( 290.9 W kg-1) but also rendered reasonable cycle stability ( 75% after 2000 charge / discharge cycles )
  9. Keywords:
  10. Supercapacitor ; Hybrid Supercapacitor ; Cobalt Oxide ; Nickle Oxide ; Nickel/Cobalt Layered Double Hydroxide ; Carbon Spheres

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